VIA SOM-6X80 User Manual
15
A.3.5. COM Connectors and Pin Header
The SOMBD3 carrier board is equipped with four COM connectors and one COM pin header. The COM
connectors are labeled as “J55”, “J57”, “J58” & “J59”, and COM pin header is labeled as “J66”. The COM
connectors support RS-232 mode while the COM pin header supports RS-485 mode. The pinouts of COM
connectors and pin header are shown below.
Figure 19: COM connectors and pin header diagram
Table 6: COM connectors pinouts
Table 7: COM pin header pinouts
J55
Pin
Signal
1
COM_A_RX
2
COM_A_TX
3
GND
4
COM_A_RTS
5
COM_A_CTS
J57
Pin
Signal
1
COM_B_RX
2
COM_B_TX
3
GND
4
COM_B_RTS
5
COM_B_CTS
J58
Pin
Signal
1
COM_C_RX
2
COM_C_TX
3
GND
4
COM_C_RTS
5
COM_C_CTS
J59
Pin
Signal
1
COM_D_RX
2
COM_D_TX
3
GND
4
COM_D_RTS
5
COM_D_CTS
J66
Pin
Signal
Pin
Signal
1 RS485-
2 RS485+
3 NC
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC